Browse Prior Art Database

Method for joining radio subscribers from different type of radio systems on common channel

IP.com Disclosure Number: IPCOM000243673D
Original Publication Date: 2015-Oct-09
Included in the Prior Art Database: 2015-Oct-09
Document File: 3 page(s) / 99K

Publishing Venue

Motorola

Related People

Chong, Tuck: INVENTOR [+2]

Abstract

This paper describes a method for joining radio subscribers of a conventional system into trunked radio systems on a common traffic channel, supported by common signaling protocol.

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Method for joining radio subscribers from different type of radio systems on common channel

By MengTuck Chong, Chebron Padmanaba,

Motorola Solutions

 

ABSTRACT

This paper describes a method for joining radio subscribers of a conventional system into trunked radio systems on a common traffic channel, supported by common signaling protocol.

PROBLEM

Public facilities such as schools, malls, hotels etc often have a private radio network. Very often these are small conventional networks.

Public safety agencies have larger networks. Often these are trunked and coverage of these networks overlap with those of the public facilities above.

During an incident at a public facility, it is often desirable to be able to have first responders from the public safety agencies and officials from the public facilities on the same network.

As use case example, a school shooting happens. Officials within the school such as guards may have mission critical information and a two way radio. If they can be placed on the same radio channel as first responders, this would allow the first responders access to this information.

SOLUTION

Provided that the over the air protocol of the trunked system and conventional system has common protocol in the payload channel (for example DMR III and DMR II), it is possible for a repeater on the trunked system to attempt an over the air takeover of a conventional channel during an Emergency situation. This would allow the conventional radios within the site coverage and the radios under the trunking system coverage to communicate each other.

OPERATION

Precondition:

The RF coverage of conventional site overlap with a trunking site, and the common traffic channel will only be available in the area of overlap.

The protocol of the common traffic channel is of the same standard family. e.g. the conventional and trunk site which use same TDMA DMR for their traffic channel protocol.

 

Process:

During incident, the trunk system allocates a trunk repeater RPTR_T at a particular Site A to takeover a conventional repeater RPTR_C.

RPTR_T needs to know the Tx/Rx frequencies, slots of RPTR_C. Also the talkgroups of conventional radios shall be made known to trunking system. RPTR_T reprograms itself to the same Tx/Rx frequencies as RPTR_C.

A supervisory radio sends a command (“Disable Repeat”) to bring RPTR_C into a disabled-repeat state. In this state RPTR_...